Fang Yuan, a graduate student in financial law, received a late-night alert that his credit card had been fraudulently charged 200,000 yuan. While his roommate panicked, he remained calm and took action—heading to an ATM overnight to withdraw cash and secure evidence, locking in the core proof that "the person and the card were not separated." Facing procedural buck-passing from the bank branch, he relied on solid professional knowledge to organize a complete chain of evidence, submitted applications through formal regulatory channels, and pushed the bank to launch a special investigation. In the end, he recovered the full principal of the fraudulent charges, obtained reasonable rights-protection compensation, and even turned this personal experience into an empirical case study for his thesis, completing a textbook-level lawful defense of rights.